Improved screw-cutting chuck



UNrrsn STATES FRANCIS H. HIGGINS, OF BORDEN'IOWN, NEW JERSEY, ASSIGNOR TO HIM'- arnN'r SELF AND-ALFRED THOMSON, 0F SAME PLAGE.

l IMPROVED SCREW-CUTTING CHUCK.

Specification forming part of Letters Patent No. 52,241?, dated January 23, 1866.

To all whom 'it may concern:

Be it known that I, F. H. HIG GINs, of Bordentown, New Jersey, have invented an Improved Cutter-Head for Screw-Cutting Machines and I do hereby declare the following to be a full, clear, and exact description of the same, rei'- erence being had to the accompanying drawings, and to the letters of reference marked thereon.

My improved cutting-head consists ot' two sections, each carrying a cutter or cutters, one section being hinged to the other, and the whole being constructed and combined with a spring-loeking lever or its equivalent, substantially as described hereinafter, so that the delay in withdrawing the screwed bolt from the cutting-heads of' ordinaryr screw-cutting machines may be avoided.

In order to enable others skilled in the art to make and use my invention, I will now proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part ot this specification, Figure 1 is a side View of sufficient of the cutter-head of a screw-cutting machine to show my improvement; Fig. 2, a sectional view of the same, showing the parts in a position differing from that exhibited in Fig. l; Fig. 3, a transverse section on the line l 2, Fig. 2.

Similar letters refer to similar parts throughout the several views.

A is a circular plate, which is bolted to the frame of the screw-cutting machine in such a position that the center of the plate shall coincide with the axis of the usual revolving boltholder.

In the center of the plate A is aprojection, B, which consists of two` portions or sections, a and a', the section c, which forms about twothirds of the projection, being secured to the plate A, While the section a is hinged at :r to the section a.

A central opening, X,of the form illustrated in the drawings, is continued through theplate A and project-ion B.

To a projecting portion, b, of the section a is hinged a lever, C, in one end of which is an opening, c, and into the latter (when the sec! tions a, a are in contact, as shown in Fig. 2)

projects a lug, d, on the section a, so that the ter, e', is fitted in a similar manner in the secl tion a.

In the ordinary bolt-cutting machines all the cutters are secured iirmly to the plate A, and their position on the same is only changed when they have to be removed, sharpened, or replaced by others, the blank-bolt being rotated and fed slowly toward the cutters, and passing between the latter until a screw-thread of the required length is cut 5 the boltis then withdrawn by imparting to it a rotary motion in the opposite direction, the cutters acting as a nut, from which the bolt must be gradually unscrewed. It will be apparent that much time is lost in withdrawing the bolt in this manner.

In the device above described the parts are brought to the position shown in Fig. 2, and the bolt is fed forward and the thread is eut in the usual manner to the desired length, after which thel lever C is depressed until it is free from the lug d, when the section a of the projection B will at once fall to the position illustrated in Fig. l, leaving the bolt free from the control of thecutters and at liberty to be quickly withdrawn, together with the bolt-holder, by any of the appliances employed in ordinary screw-cutting machines. After this another blank-bolt is applied to the holder and the section a:of the projection B locked to the section a by the lever C, as before. v

It will be evident that by the use of the above-described device the operation of cut- .tin g threads on bolts is facilitated.

l claim as my invention and desire to secure by Letters Patenthe Within-d eseribed cutter-head, composed Intestmony whereof I have signed my name bhe section a with its cutters, and. the seeto this specification in the presence of two sub- 1 a with its cutters,the latter being hinged seribing Witnesses. he former, and the whole being constructed FRANCIS H. HIGGINS. l combined with the looking-spring lever Witnesses:

substantially as and for the purpose set G. S. CANNON, bh. EUGENE Aimes. 

